Preparation method for wear-resistant polyester material

Abstract

To provide a preparation method for a wear-resistant polyester material.SOLUTION: The present invention provides a preparation method for a polyester material in a continuous process, the method comprising: crushing, compacting, and drying a recycled release film, and then melting, extruding, and degassing the recycled release film; thickening with a liquid viscosifying system after filtration; melting and kneading, modifying with a modifier including a nucleating agent, a lubricant, and an antioxidant, extruding, pelletizing, and dehydrating to produce the polyester material.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a polyester material, and particularly to a method for manufacturing a wear-resistant polyester material.

Background Art

[0002] It is considered that in the future market, the circular economy and the flow of plastic recycling and reuse will gradually progress. Under such market trends, the introduction of single-material products and recycled materials has become an important goal for future development. The introduction of recycled materials does not affect mechanical properties and processability, and by introducing environmentally friendly recycled materials, it contributes to achieving global carbon reduction and energy conservation goals. A single-material product means a product in which the material used is single. When the service life of the product is reached, it can be directly recovered and remanufactured, thus avoiding a decrease in recyclability due to the mixing of different materials.

[0003] To realize a single-material product, it is necessary to replace POM, nylon, and other fasteners and peripheral accessories with PET polyester materials. However, since the unmodified PET material has a slow crystallization rate, insufficient heat resistance, and a large friction coefficient, it is difficult to directly use it as an injection substitute for POM, nylon, etc.

[0004] In the existing technical field of the method for manufacturing a wear-resistant polyester material, mainly inefficient and high-energy-consuming divided processes are adopted. More specifically, for example, Process 1, Process 2, and Process 3 can be carried out in a subdivided manner. In Process 1, the recycled release film is pulverized, and after the pulverized film is compressed and dried, it is melted, extruded, and degassed. After filtration, granulation, and dehydration, low-viscosity PET recycled particles can be obtained. Then, Process 2 is executed. In Process 2, the low-viscosity PET recycled particles are subjected to solid-phase polymerization and mixed with an expanding agent to form medium-viscosity and high-viscosity PET recycled particles. Finally, Process 3 is executed. In Process 3, the medium-high-viscosity PET recycled particles are melted, kneaded, and extrusion-molded, modified using a modifier, granulated, and dehydrated to obtain a high-strength flame-retardant polyester material.

[0005] From the above, in response to the trend of global environmental protection such as plastic reduction and energy conservation, developing a method for manufacturing an impact-resistant polyester composition to improve production efficiency and reduce energy consumption has become an important research topic currently required.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention provides a method for manufacturing a polyester material mainly adopting a continuous process with high efficiency and low energy consumption. It can produce a polyester material with high crystallinity and excellent abrasion resistance, improve the problems of slow crystallization rate and insufficient heat resistance of the PET material, and reduce the friction coefficient on the surface of the PET material to improve abrasion resistance.

Means for Solving the Problems

[0007] The present invention provides a method for manufacturing a polyester material, which is a continuous process and includes the following steps. The recycled release film is crushed, compressed, and dried, and then melted, extruded, and degassed. After filtration, it is thickened using a liquid thickening system. Then, it is melt-kneaded, modified with a modifier, extruded, granulated, and dehydrated to produce a polyester material. Here, the modifier includes a nucleating agent, a lubricant, and an antioxidant.

[0008] In one embodiment of the present invention, the abrasion amount of the polyester material is less than 300 mg.

[0009] In one embodiment of the present invention, the manufacturing method further includes removing the surface coating of the recycled release film using a film surface ceramic slurry removal technique before crushing, compressing, and drying the recycled release film.

[0010] In one embodiment of the present invention, the liquid thickening system is used to increase the intrinsic viscosity (IV) from a viscosity range of 0.5 dl / g to 0.62 dl / g to a viscosity range of 0.7 dl / g to 0.92 dl / g.

[0011] In one embodiment of the present invention, the grinding, compression, and drying temperatures of the recycled release film are 100°C to 160°C.

[0012] In one embodiment of the present invention, the melting, extrusion, and degassing temperatures are 240°C to 280°C.

[0013] In one embodiment of the present invention, the melting and kneading temperature is 230°C to 275°C.

[0014] In one embodiment of the present invention, the modification and extrusion temperatures are 230°C to 280°C.

[0015] In one embodiment of the present invention, the nucleating agent includes an organic nucleating agent, an inorganic nucleating agent, or a mixture thereof.

[0016] In one embodiment of the present invention, the organic nucleating agent includes an organic sodium salt, and the organic sodium salt includes sodium benzoate, sodium montanate, or ethylene-methacrylic acid copolymer (EMAA).

[0017] In one embodiment of the present invention, the inorganic nucleating agent includes inorganic micro-nano powder, and the inorganic micro-nano powder includes talc, titanium dioxide, silica, or calcium carbonate.

[0018] In one embodiment of the present invention, the antioxidant includes a hindered phenol antioxidant, a phenolic antioxidant, a phosphite antioxidant, a composite antioxidant, or a combination thereof.

[0019] In one embodiment of the present invention, the lubricant includes a stearate, a polyethylene wax, a siloxane modifier, or a fluororesin.

[0020] In one embodiment of the present invention, based on the total weight of the polyester material, the addition amount of the nucleating agent is 0.5 wt% to 3 wt%, the addition amount of the antioxidant is 0.1 wt% to 1 wt%, and the addition amount of the lubricant is 0.05 wt% to 1 wt%.

Advantages of the Invention

[0021] Based on the above, the present invention provides a method for manufacturing a polyester material mainly adopting a continuous process with high efficiency and low energy consumption. It can produce a polyester material with high crystallinity and excellent wear resistance, improve the problems of slow crystallization rate and insufficient heat resistance of the PET material, reduce the friction coefficient on the surface of the PET material, and improve the wear resistance. The wear-resistant polyester material manufactured by the present invention can be used for zippers, buckles, curtain parts, stationery, machine casings, etc. to achieve the goal of a single material.

Embodiments for Carrying out the Invention

[0022] Hereinafter, embodiments of the present invention will be described in detail. However, these embodiments are illustrative, and the present invention is not limited thereto.

[0023] Note that in this specification, the range of "from one value to another value" is a general expression to avoid listing all values within that range. Therefore, the description of a specific numerical range includes any numerical value within that range and any smaller numerical range surrounded by any numerical value within that range, as if the specification described any numerical value and any smaller numerical range.

[0024] The present invention provides a method for manufacturing a polyester material, which is a continuous process and includes the following steps. First, the surface coating of the recycled release film is removed using a film surface ceramic slurry removal technique. Next, the recycled release film is pulverized, compressed, and dried, and then melted, extruded, and degassed. After filtration, it is thickened using a liquid thickening system. Then, it is melt-kneaded, modified with a modifier, extruded, granulated, and dehydrated to produce a polyester material. Here, the wear amount of the polyester material is less than 300 mg.

[0025] In this embodiment, the liquid thickening system is used to increase the intrinsic viscosity (IV) from a viscosity range of 0.5 dl / g to 0.62 dl / g to a viscosity range of 0.7 dl / g to 0.92 dl / g. As a result, the mechanical properties, flame retardancy, and fluidity of the environmentally friendly recycled particles are equivalent to those of virgin particles.

[0026] In this embodiment, the pulverization, compression, and drying temperature of the recycled release film is, for example, 100°C to 160°C. The melting, extrusion, and degassing temperature is, for example, 240°C to 280°C. The melt-kneading temperature is, for example, 230°C to 275°C. The modification and extrusion temperature is, for example, 230°C to 280°C.

[0027] In this embodiment, the modifier may include a nucleating agent, a lubricant, and an antioxidant. Hereinafter, each of the above-described components will be described in detail.

[0028] Nucleating agent

[0029] In this embodiment, the nucleating agent may include an organic nucleating agent, an inorganic nucleating agent, or a mixture thereof. The organic nucleating agent includes an organic sodium salt, and the organic sodium salt includes sodium benzoate, sodium montanate, or ethylene-methacrylic acid copolymer (EMAA). The inorganic nucleating agent includes inorganic micro / nano powder, and the inorganic micro / nano powder includes talc, titanium dioxide, silica, or calcium carbonate. Based on the total weight of the polyester material, the addition amount of the nucleating agent is, for example, 0.5 wt% to 3 wt%. Preferably, the addition amount of the nucleating agent is, for example, 1 wt% to 2 wt%. By adding the nucleating agent, the crystallization and solidification rates of the PET material can be improved, thereby improving its processability.

[0030] Lubricant

[0031] In this embodiment, the lubricant may include a stearate, polyethylene wax, siloxane modifier, or fluororesin. The addition amount of the lubricant is, for example, 0.05 wt% to 1 wt% based on the total weight of the polyester material. By adding the lubricant, the surface friction coefficient can be reduced, and the wear resistance of the product can be improved.

[0032] Antioxidant

[0033] In this embodiment, the antioxidant may include a hindered phenolic antioxidant, a phenolic antioxidant, a mixed antioxidant, a phosphite antioxidant, a composite antioxidant, or a combination thereof. The addition amount of the antioxidant is, for example, 0.1 wt% to 1 wt% based on the total weight of the polyester material. The antioxidant can improve the heat resistance and processability of the material.

[0034] Hereinafter, the above manufacturing method of the wear-resistant polyester material of the present invention will be described in detail by experimental examples. However, the following experimental examples do not limit the present invention.

[0035] Experimental Example

[0036] In order to demonstrate that the method for manufacturing a polyester material proposed by the present invention can manufacture a wear-resistant polyester material and reduce the surface friction coefficient of a PET material to improve wear resistance, experimental examples were specifically carried out as follows.

[0037] Test method

[0038] Impact strength: ASTM D256 Tensile strength: ASTM D638 Flexural strength, flexural modulus: ASTM D790 Material cooling crystallization temperature (T hc ): ASTM D3418 Surface hardness: In accordance with ASTM D3363, the surface hardness was evaluated by a scratch hardness (pencil method) test with a load of 300 g. Rockwell hardness: ASTM D785 Static / dynamic friction coefficient: ASTM D1894 Wear loss amount: In accordance with ASTM D3884, it was evaluated using a Taber type wear tester. The weight change (wear loss amount) after 2000 revolutions of the wear test with a wear wheel type H-22, a wear wheel load of 1 kg (9.8 N), and a rotational speed of 60 rpm on the sample was measured. The smaller the value, the better the wear resistance.

[0039] Material property evaluation

[0040] The POM, unmodified PET, and polyester materials manufactured by the manufacturing method of the present invention were tested according to the above test method, and the test results are shown in Table 1 below. Since the manufacturing method of the polyester material of the present invention has been described in detail above, it will not be described in detail here. The manufacturing conditions of the polyester material manufactured by the manufacturing method of the present invention in Table 1 are as follows. It was thickened using a liquid thickening system to increase the intrinsic viscosity (IV) to 0.82 dl / g. The recycled release film was recovered, pulverized, compressed, and dried at 120°C. The melt extrusion and degassing temperature was 255°C, the melting and kneading temperature was 265°C, and the modification and extrusion temperature was 265°C. Based on the total weight of the polyester material, the addition amount of the nucleating agent was 1.2 wt%, the addition amount of the lubricant was 0.7 wt%, and the addition amount of the antioxidant was 0.7 wt%.

[0041] As can be seen from Table 1 below, the polyester material manufactured by the manufacturing method of the present invention has good mechanical properties and wear resistance, and the wear amount of the polyester material is less than 300 mg. The present invention can mainly reduce the surface friction coefficient and improve the wear resistance of the product by adding a lubricant. By adding an antioxidant, the heat resistance and processability of the material can be improved. By adding a nucleating agent, the crystallization and solidification speed of the PET material can be improved, and the shrinkage rate can be effectively improved.

[0042]

Table 1

[0043] In summary, the present invention provides a method for manufacturing a wear-resistant polyester material that mainly employs a continuous process with high efficiency and low energy consumption and has the advantage of low carbon emissions. Thereby, it can improve the problems of slow crystallization rate and insufficient heat resistance of the PET material, reduce the surface friction coefficient of the PET material, and improve the wear resistance, to produce a high-performance wear-resistant crystallized polyester material for single-material applications. The wear-resistant polyester material produced by the present invention can be used for zippers, buckles, curtain parts, stationery, machine casings, etc. to achieve the goal of a single material. On the other hand, in the present invention, a recycled release film is used as the PET raw material, and its mechanical properties, wear resistance, and fluidity are equivalent to those of virgin particles. Therefore, it can contribute to the global goals of plastic reduction and energy conservation.

Industrial Applicability

[0044] The method for manufacturing the polyester material of the present invention can be applied to zippers, buckles, curtain parts, stationery, machine casings, etc.

Claims

1. 1. A method for producing a polyester material which is a continuous process, comprising the steps of: grinding, compressing, and drying the recycled release film, and then melting, extruding, and degassing the recycled release film; thickening the mixture using a liquid thickening system after filtration; Melting, kneading, modifying with modifiers including nucleating agents, lubricants and antioxidants, extruding, granulating and dehydrating the polyester material; A method comprising:

2. The abrasion loss of the polyester material is less than 300 mg. A method for producing the polyester material according to claim 1.

3. Further comprising removing the surface coating of the recycled release film using a film surface ceramic slurry removal technique before crushing, compressing and drying the recycled release film. A method for producing the polyester material according to claim 1.

4. The liquid thickening system is used to increase the intrinsic viscosity (IV) from a viscosity range of 0.5 dl / g to 0.62 dl / g to a viscosity range of 0.7 dl / g to 0.92 dl / g. A method for producing the polyester material according to claim 1.

5. The crushing, compressing and drying temperature of the recycled release film is 100°C to 160°C; A method for producing the polyester material according to claim 1.

6. The melting, extrusion and degassing temperatures are between 240°C and 280°C. A method for producing the polyester material according to claim 1.

7. The melting and kneading temperature is 230°C to 275°C. A method for producing the polyester material according to claim 1.

8. The temperature of the modification and extrusion is 230°C to 280°C. A method for producing the polyester material according to claim 1.

9. The nucleating agent comprises an organic nucleating agent, an inorganic nucleating agent, or a mixture thereof; A method for producing the polyester material according to claim 1.

10. The organic nucleating agent comprises an organic sodium salt, the organic sodium salt comprising sodium benzoate, sodium montanate or ethylene-methacrylic acid copolymer (EMAA); A method for producing the polyester material according to claim 9.

11. The inorganic nucleating agent includes an inorganic micro-nano powder, the inorganic micro-nano powder includes talc, titanium dioxide, silica or calcium carbonate; A method for producing the polyester material according to claim 9.

12. The antioxidant includes a hindered phenol-based antioxidant, a phenol-based antioxidant, a phosphite-based antioxidant, a complex antioxidant, or a combination thereof. A method for producing the polyester material according to claim 1.

13. The lubricant comprises a stearate, a polyethylene wax, a siloxane modifier, or a fluororesin; A method for producing the polyester material according to claim 1.

14. Based on the total weight of the polyester material, the amount of the nucleating agent is 0.5 wt % to 3 wt %, the amount of the antioxidant is 0.1 wt % to 1 wt %, and the amount of the lubricant is 0.05 wt % to 1 wt %. A method for producing the polyester material according to claim 1.

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